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Old 07-20-2021, 12:32 PM
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Smoking gun - ammo or barrel residue?



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What causes a smoking gun? Sometimes mine smokes more than others?
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Old 07-20-2021, 12:39 PM
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Difference in lube, and or powder between manufacturers .
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Old 07-20-2021, 01:06 PM
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I blame it on cigarette advertising.
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Old 07-20-2021, 01:19 PM
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Think of that smoke as a really good wind flag.
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Old 07-20-2021, 01:26 PM
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Quote:
Originally Posted by whiplash
What causes a smoking gun? Sometimes mine smokes more than others?
I've noticed my pistols don't smoke until they get warmed up good. Then every round smokes - using the same ammo as before.

My guess is a warm barrel causes the air in the bore to expand so there's less oxygen in that volume. Then successive shots fail to burn as much of the powder, resulting in more visible smoke.

Just a guess. It'd be nice to have a definitive explanation.
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Old 07-20-2021, 01:28 PM
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Leaving oil in the bore is the usual culprit.
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Old 07-20-2021, 02:37 PM
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Criminals.
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Old 07-20-2021, 02:37 PM
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Remington ammo.
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Old 07-20-2021, 03:14 PM
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Old 07-20-2021, 07:35 PM
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Quote:
Originally Posted by Test_Engineer View Post
I've noticed my pistols don't smoke until they get warmed up good. Then every round smokes - using the same ammo as before.

My guess is a warm barrel causes the air in the bore to expand so there's less oxygen in that volume. Then successive shots fail to burn as much of the powder, resulting in more visible smoke.

Just a guess. It'd be nice to have a definitive explanation.
Your description is closest to what I experienced today.

The other comments are pretty entertaining though.
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Old 07-21-2021, 10:19 AM
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My guess is a warm barrel causes the air in the bore to expand so there's less oxygen in that volume. Then successive shots fail to burn as much of the powder, resulting in more visible smoke.
Correct about the air expansion, but not the answer. The loaded round is in the rear (chamber end) and therefore would push out all of the air when fired. The smoke would be from behind the bullet and not ahead of it. Not an answer but just a thought.
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Old 07-21-2021, 11:08 AM
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Barrel heat causing bullet wax residue to burn off.
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Old 07-21-2021, 11:48 AM
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Quote:
Originally Posted by farm boy View Post
Correct about the air expansion, but not the answer. The loaded round is in the rear (chamber end) and therefore would push out all of the air when fired. The smoke would be from behind the bullet and not ahead of it. Not an answer but just a thought.
You're correct that the bullet pushes the (low oxygen) air out ahead of the bullet, but it's then sitting right in front of the muzzle. They say it takes about 16" of barrel for powder to burn completely. My pistol barrels are 8" or less, so burning/unburned powder also exits the muzzle. If it's exiting into an area of low oxygen, it can't burn completely.

This also matches my experience. I've never had my .22 rifles put out smoke like my pistols do. But then, maybe my rifle barrels just aren't able to get that hot.
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Old 07-21-2021, 11:49 AM
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Quote:
Originally Posted by farm boy View Post
Correct about the air expansion, but not the answer. The loaded round is in the rear (chamber end) and therefore would push out all of the air when fired. The smoke would be from behind the bullet and not ahead of it. Not an answer but just a thought.
Logically thought out! Firearm primer/propellants make their own oxygen. Because of this they can be fired underwater as well as in outer space.

Quote:
Originally Posted by JDWinCO View Post
Barrel heat causing bullet wax residue to burn off.
Certainly could be possible. Or and the higher temperature could mean that ammo like......

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Originally Posted by Nick7274 View Post
Remington ammo.
...... is burning more of its smokier burning primer/propellant as the heat increases burn rate.
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Old 07-21-2021, 12:46 PM
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Quote:
Originally Posted by Test_Engineer View Post
You're correct that the bullet pushes the (low oxygen) air out ahead of the bullet, but it's then sitting right in front of the muzzle. They say it takes about 16" of barrel for powder to burn completely. My pistol barrels are 8" or less, so burning/unburned powder also exits the muzzle. If it's exiting into an area of low oxygen, it can't burn completely.

This also matches my experience. I've never had my .22 rifles put out smoke like my pistols do. But then, maybe my rifle barrels just aren't able to get that hot.
True dat (as the young people say). This was my experience with my semi-auto pistols and not rifles.
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